JPS582327Y2 - Ruby lens moving device in slit lamp microscope - Google Patents

Description

[Detailed explanation of the invention] In this invention, light from a light source passes through a condenser lens and a slit, passes through an objective lens, is reflected in a substantially horizontal direction by a reflector, and illuminates the eye to be examined. This invention relates to a device for moving a ruby lens that is inserted, if necessary, just in front of an eye to be examined in a slit lamp microscope for observation.

When examining the eye using a slit lamp microscope, a ruby lens consisting of a concave lens system is inserted just in front of the eyeball on the optical axis of the microscope.
A virtual image of the fundus is formed near the cornea, the microscope is focused on the bulge, and the ruby lens is moved back and forth on the optical axis of the microscope depending on the degree of nearsightedness, farsightedness, etc., to detect irregularities in the eyelid and vitreous detachment. Methods for observing this are already known.

Figure 1 shows the optical path diagram of the ruby lens optical system.
l is the eye to be examined, U is the ruby lens, M is the reflector, L...
L2 is the objective lens and eyepiece of the microscope, E2 is the observer's eye, and the slit lamp illumination light from the direction of the arrow is reflected by the mirror M.
The light is reflected by the eye and enters the eye E1 to be examined, and is reflected by the fundus of the eye to form a virtual image of the fundus near the cornea as shown by the broken line in the figure, which is observed with a microscope.

Here, the ruby lens is required to escape the jaw rest and move accurately back and forth along the optical axis of the microscope between the eye to be examined and the microscope, and in addition, if the ruby lens is not required, it can be easily removed from the main body. It must be removable so that it can be removed.

Conventional ruby lenses are usually attached to a holding member that is horizontally slidable on the chin rest, but the device becomes large and obstructs operation, and at the same time, it is difficult to attach and remove it from the holder. Moreover, due to the precision of the sliding parts, it was extremely difficult to accurately move the ruby lens back and forth along the optical axis of the microscope.

This idea was made in view of the above points.The main lever is pivotally attached to a main shaft on a pedestal that is detachable from the main body, and the lever is connected with a cam so that it can rotate and slide according to the main lever. By engaging the lower end of the slave lever with the main cam groove provided on the pedestal and pivoting the ruby lens holding lever to the upper end of the slave lever, the ruby lens escapes from the chin rest and is moved along the optical axis of the microscope. The purpose is to move it back and forth accurately.

This invention will be explained below with reference to embodiments shown in FIGS. 2 to 4.

Figure 2 shows the state of use of the slit lamp microscope equipped with the ruby lens moving device according to this invention, where A is the light source L.
S, a lamp house with a built-in condenser lens CL and a slit S, B a projector with a built-in first objective lens L3 and a second objective lens L4, C a main body support arm, D a microscope,
F is a chin rest, G is a head fixation band, and H is a ruby lens moving device.

3 and 4 show the details of the ruby lens moving device H. Reference numeral 1 denotes a base of the moving device, which is coaxial with the rotation center axis C□ (FIG. 2) of the main body support arm C when installed. The moving device H is inserted into the shaft 2 on the line and the guide plate C2 of the main body support arm C.
A protrusion 3 for positioning is integrally formed on the lower surface,
A pair of main bearings 5 having a main shaft 4 fixed thereon and a main cam plate 6 having a main cam groove 6a are integrated on the upper surface.

7 is a substantially L-shaped main lever whose one end is pivotally connected to the main shaft 4, which is integrated with a horizontal arm 7a, and above which a first pin 8 is attached.
A second pin 9 is implanted in the middle portion, and a third pin 10 is implanted in the free end portion.

Reference numeral 11 denotes a vertical long groove 1 in the vertical direction into which the first pin 8 is loosely fitted.
1a and an auxiliary cam groove 11b into which the second pin 9 is loosely fitted. An operating knob 13 for forward and backward movement is attached nearby.

Reference numeral 14 denotes an L-shaped ruby lens holding lever that holds the ruby lens U. The horizontal arm 14 is pivotally connected to the upper end of the slave lever 11 by a shaft 15, and is parallel to the horizontal arm 7a of the main lever 7.
A pin 16 is implanted at the tip of a, and this pin 16 and the shaft 15
The position of the pin 16 is determined so that the gap is equal to the gap between the first pin 8 and the third pin 10.

A pair of auxiliary levers 17 rotatably hold the pin 16 at the upper end and the pin 10 at the lower end, and are connected to a plurality of screws 1.
8 and nut 19, the clamping frictional force is adjustable and coupled,
The middle portion is integrally fixed via a spacer 20.

The ruby lens moving device according to the second invention has the above-mentioned configuration, and as shown in Fig. 2, the shaft 2 is inserted into the insertion hole C3 provided in the main body of the slit lamp microscope, and the device is attached to the slit lamp microscope. When the operating knob 13 is moved back and forth with the 11JI E 1 positioned near the intersection of the center axis C1 of the main body and the optical axis of the microscope, the first and second pins 8 and 9 of the main lever 7 and the slave lever 11 main cam pins 12 slide within the vertical long grooves 11a, the auxiliary cam grooves 11b, and the main cam grooves 6a, and at the same time the slave lever 11 rotates around the first pin 8, the main lever 7 also rotates around the main shaft 4. oscillating around the
The first pin 8 slides vertically within the vertical long groove 11a.

Here, if the main cam groove 6a and the auxiliary cam groove 11b are appropriately selected, the shaft 15 can be kept at the same height.

In addition, the horizontal arm 7a of the main lever 7, the slave lever 11, the horizontal arm 14a of the ruby lens holding lever 14, and the auxiliary lever 17, which have joints at the first pin 8, third pin 10, pin 16, and shaft 15, are parallel to each other. Since it forms a quadrilateral four-joint link, it moves from the state shown in Figure 3 to the state shown in Figure 4, and the ruby lens U held by the ruby lens holding lever 14 also moves approximately 40 mm parallel to the optical axis of the microscope ( (from the position shown by the solid line to the position shown by the imaginary line in FIG. 2).

The friction force between the auxiliary lever 17 and the pin 10.16 allows it to stand still at any desired position.

In principle, the ruby lens U should be perpendicular to the optical axis of the microscope, but in order to prevent harmful rays from surface reflection, it is actually installed at an angle of about 6 degrees to the vertical direction. is desirable.

As described above, according to this invention, in a ruby lens moving device that is detachable from a slit lamp microscope, it is possible to accurately move the ruby lens through the chin rest and along the optical axis of the microscope using a simple mechanism. can.

In addition, since the movement is based on a link mechanism and a cam, it does not require precision compared to conventional sliding movement, is extremely smooth and nimble, and can be easily set at a desired position.

Furthermore, by mounting the ruby lens moving device H so that the main shaft 4 is located on the rotation center axis C1 of the slit lamp microscope main body C, the microscope lens can be rotated in the horizontal direction about the rotation center axis. When the eye E1 to be examined is observed from various angles, the ruby lens U also follows and rotates, so that the optical path relationship shown in FIG. 1 is always maintained, which is convenient.

[Brief explanation of the drawing]

Figure 1 is an optical path diagram of the ruby lens optical system, Figure 2 is a side view showing the state of use of the slit lamp microscope to which this invention is applied, and Figures 3 and 4 are the two sides of the ruby lens moving device according to this invention. It is a side view which shows a moving end state. 1...Pedestal, 4...Main, axis, 6a...
...Main cam groove, 7...Main lever, 8...
...1st pin, 9...2nd pin, 10...
...Third pin, 11...Follow lever, 11 a
... Vertical long groove, 11 b ... Auxiliary cam groove, 13 ... Operation knob for forward and backward movement, 14 ...
...Ruby lens holding lever, 17...Auxiliary lever, U...Ruby lens, H...
・Ruby lens moving device.

Claims (1)

[Scope of utility model registration request] In a slit lamp microscope, in which light from a light source passes through a condenser lens and a slit, passes through an objective lens, is reflected approximately horizontally by a reflector to illuminate the eye to be examined, and the eye to be examined is observed using a microscope. A detachable pedestal 1, an L-shaped main lever 7 that rotates around a main shaft 4 whose one end is mounted on a main bearing 5 on the pedestal, and a main cam whose lower end is a main cam plate 6 on the pedestal. The first . A slave lever 11 having upper and lower elongated grooves 11a and auxiliary cam grooves 11b with which the second pins 8 and 9 engage, respectively, and pivotally supporting an L-shaped ruby lens holding lever 14 that holds a ruby lens U at its upper end. , an operation knob 13 for forward and backward movement attached to the upper part of the slave lever 11, and horizontal arms 7a, 14 integrally provided to the upper part of the main lever 7 and the lower part of the ruby lens holding lever 14, respectively. a
The ruby lens U is moved on the optical axis of the microscope by moving the operation knob 13 for forward and backward movement back and forth. Ruby lens moving device.